Question

Which of the following statement defines the term 'deformation' regarding elastic material?
1. working of friction between the two surfaces
2. increase in temperature of molecules due to heating
3. the atoms or molecules of the body are displaced from their equilibrium positions
4. blowing of balloons 

Answer 1

Correct Answer - Option 3 : the atoms or molecules of the body are displaced from their equilibrium positions

CONCEPT:

• Deformation refers to the change in size or shape of an object.
  • When there is a change in distance between molecules of an object, deformation occurs.

EXPLANATION:​

• Each molecule in the elastic solids is acted upon by the forces because of neighboring molecules.
• When an external force is applied, the molecules inside it are displaced from their equilibrium positions (fixed points of lattice points) causing a change in intermolecular and interatomic distances.
• Overall the shape or size of the body is changed. This makes the body to get deformed.
• So when there is a change in distance between molecules of an object, deformation occurs.

• Hence the correct answer is option 2.